Connect with TRB

STUDIES LEADING TO CHOICE OF EPOXY ASPHALT FOR PAVEMENT ON STEEL ORTHOTROPIC BRIDGE DECK OF SAN MATEO-HAYWARD BRIDGE

LONG-SPAN BRIDGES WITH ORTHOTROPIC STEEL DECKS HAVE CREATED THE NEED FOR A LIGHTWEIGHT, DURABLE SURFACING TO ACT AS BOTH A LEVELING COURSE AND PAVEMENT. THE PAVEMENTS USED BY THE ORIGINATORS OF ORTHOTROPIC STEEL DECK PLATE GIRDERS IN EUROPE ARE NOT FEASIBLE FOR USE IN THIS COUNTRY. DEVELOPMENTS IN SYNTHETIC RESIN PAVEMENTS SHOW PROMISE. THE PROBLEM INSOFAR AS AVAILABLE MATERIALS ARE CONCERNED, IS RELATED TO OVERLAYS USED TO REPAIR DAMAGED PORTLAND CEMENT CONCRETE BRIDGE DECKS. THE EXPERIENCES OF THE CALIFORNIA DIVISION OF BAY TOLL CROSSINGS ON MAJOR TOLL BRIDGES IN THE SAN FRANCISCO BAY AREA ARE RELATED. THESE INCLUDE CHOICE OF A THIN EPOXY COAL TAR OVERLAY, 1/8 IN. TO 3/16 IN. THICK ON THE SAN FRANCISCO-OAKLAND BAY BRIDGE CONCRETE DECKS, AND CHOICE OF AN EPOXY ASPHALT CONCRETE PAVEMENT, 1-1/2 IN. TO 2-1/2 IN. THICK ON THE STEEL ORTHOTROPIC DECK OF THE SAN MATEO-HAYWARD BRIDGE. THE FIRST EPOXY COAL TAR WAS EXPERIMENTALLY APPLIED TO THE SAN FRANCISCO-OAKLAND BAY OVER 20 MATERIALS ARE STILL IN PROGRESS. THE AUTHOR BELIEVES THAT WHEN NUMERICAL CRITERIA HAVE BEEN ESTABLISHED VARIOUS RESINS MAY BE SATISFACTORY IF ACCEPTABLE APPLICATION METHODS CAN BE DEVELOPED. A CLEARINGHOUSE FOR ACCUMULATION OF EXPERIENCE ON THE SUBJECT IS REQUIRED. EXPERIMENTAL APPLICATIONS ARE NEEDED. THE METHODS FOR MEASURING ADHESION IN DIRECT TENSION ON A DIAMOND-DRILL CUT CORE AND FATIGUE IN BENDING ARE MENTIONED AS A START ON THE PROBLEM OF ESTABLISHING NUMERICAL CRITERIA. /AUTHOR/